\begin{document}$ \Delta I = 2 $\end{document} bifurcation) in rotational bands associated with scissors vibrations in \begin{document}$ ^{156} {\rm{Gd}}$\end{document}. In the present work, we extended the study by systematically changing the model parameters (deformation and strength of the monopole-pairing force) for the \begin{document}$ ^{156} {\rm{Gd}}$\end{document} calculation. We also calculated additional isotopes and isotones with respect to \begin{document}$ ^{156} {\rm{Gd}}$\end{document}. In all calculations, we found a similar occurrence of the \begin{document}$ \Delta I = 2 $\end{document} bifurcation in the results. Thus, we confirmed that the bifurcation behavior of the scissors rotational bands originates from the self-organizing effects of deformed proton and neutron bodies during the scissors motion, independently of the model parameters."> Robust occurrence of ∆<i>I</i> = 2 bifurcation in scissors rotational bands -
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